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0 votes
12.0k views
in Chemistry by (15 points)
edited by

Which of the following ions is not expected to be coloured?

(1) Mn2+

(2) Ti3+

(3) Fe3+

(4) Cu+

by (10 points)
(4)cu+ is correct

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2 Answers

+3 votes
by (65.0k points)

In order to predict colour, let us examine (n – 1)d conguration of each specie.

+1 vote
by (48.4k points)
Ti+3 [Ar]3d  Ti+3 has one unpaired electron due to d-d transition it shows colour.
Cu+ [Ar]3d104s° Cu+ has no unpaired electron it means there is no transition take place because of that it is colour less.
Mn+2 [Ar]3d5 Mn+2 has five unpaired electrons due to forbidden d-d transition it shows light pink colour.
Fe+3 [Ar]3d5 Fe+3 has also five unpaired electrons and due to d-d transition it shows yellow colour.

Hence Cu+ does not show any colour. 

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